Wireshark is the world's foremost network protocol analyzer. It lets you see what's happening on your network at a microscopic level. It is the de facto (and often de jure) standard across many industries and educational institutions. Wireshark development thrives thanks to the contributions of networking experts across the globe. It is the continuation of a project that started in 1998.
CaseFile is the little brother to Maltego. It targets a unique market of 'offline' analysts whose primary sources of information are not gained from the open-source intelligence side or can be programmatically queried. We see these people as investigators and analysts who are working 'on the ground', getting intelligence from other people in the team and building up an information map of their investigation.
dbd is a Netcat-clone, designed to be portable and offer strong encryption. It runs on Unix-like operating systems and on Microsoft Win32. dbd features AES-CBC-128 + HMAC-SHA1 encryption (by Christophe Devine), program execution (-e option), choosing source port, continuous reconnection with delay, and some other nice features.